Eraser holder



Jan. 20

KENNEDY ERASER HOLDER 1 Filed Sept. l5 1924 21 m v A Patented r.ian. 2%, i225.

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JOSEPH P. KENNEDY, OF CHICAGO, ILLINOIS.

FRASER HOLDER.

Application filed September 15, 1924. Serial No. 737,798.

To all who it may concern:

Be it known that I, JosEPH P. KENNEDY, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Eraser Holders, of which the following is a specification.

My invention relates to a holder or re tainer for a blackboard eraser and my object is to provide a device of this type which can be inexpensively manufactured, which will be of sightly appearance, and which can be readily attached to and detached from the chalk rail of the blackboard. I have also had in View making the device strong and stiif enough so that it will not be broken or bent, or its hold on the chalk rail loosened by pressure in case, for example, a pupil should lean against it.

The invention is illustrated in a preferred embodiment in the accompanying drawing, wherein Fig. 1 is a fragmentary view in perspective of the blackboard chalk rail, holder and eraser in the holder.

Fig. 2 is a cross sectional view of the chalk rail and holder.

Fig. 3 is a similar View, but at a different place on the rail, to illustrate the method of attaching the retainer to and detaching the same from the chalk rail.

Fig. 4 is a sectional view on line &t of Fig. 2 in the direction of the arrow.

Fig. 5 is a view, in perspective, of the holder, and

Fig. 6 is a similar view of the key, preferably tapered for fastening the holder to the chalk rail.

Referring to the drawing:

The blackboard (Figs. 2 and 3) is shown at 10. 11 is the chalk rail of usual form consisting of a back piece 12, to which the rail proper, designated 13, is attached. The edge of the rail 13 is formed with a head 14, the upper surface of which is curved.

The eraser holder or retainer preferably consists of a single piece of sheet metal cut and formed so as to have a configuration as follows: The lower edge of the sheet or body of the retainer 15 is bent inwardly (with respect to the intended position of the device on the blackboard chalk rail) and upwardly so as to form a curved lip 16 extending the length of the device. The device is preferably made of steel so that this lip, though stiff, has some resiliency. It is preferably tapered, in the direction of its length, both as to its depth and also as to its width. The sheet 15 is apertured at 171'7 and the metal along the lower edges of these apertures is bent inwardly and then downwardly to form a pair of spring lips 18-18. Obviously there might be a single lip 18, only, or there might be more than two. On the end edges 19 of the holder are inwardly projecting wings 20 which serve to retain the eraser 21 (Fig. 1) in the holder. The lower edges 22 of these wings are diagonal so as to allow the device to be applied to the chalk rail, as will be hereinafter described.

A key 23 (Fig. 6) is provided to lie within the lip 16 and against the underside of the chalk rail. If the lip 16 is tapered, as above described, the key 23 will, naturally, be tapered correspondingly. The key may be either fastened to the chalk rail, as for example by the screws 24; or it may be simply placed against the chalk rail, without fastening means, and held by the hand until the engagement of the holder with the chalk rail and key is effected. With this in View, the upper face of the key is preferably roughened by suitable serrations 25.

The device is applied to the chalk rail, as follows: The upper spring lips 18 are hooked over the rounded or beaded edge of the chalk rail with the device tilted toward the blackboard, as shown in Fig. 3. This is done at a place on the rail to one side of the small end of key 23, assuming the key to be screwed to the underside of the rail. The device is then moved to a vertical position and slid along the rail until the lower spring lip 16 firmly engages key 28. This operation spreads the upper and lower lips apart, to some extent, so that the device has a very firm and reliable hold on the chalk rail. However, if necessary, for example, in cleaning the chalk rail, the eraser holder may be very easily removed by reversing the operations above described. Being made of stiff spring steel, the device is not easily broken or permanently bent. Pressure against the device from the outside tends to increase the grip of the lower lip on the key and does not affect the grip of the upper spring lip, due largely to the fact that lips 18 are spaced from the adjacent upright portions 26 of the retainer, as indicated at 27. In other words, the upright portions 26, 26, 26 will bend without bending the lips.

of the appended claims. i

Vhile I have illustrated and described my invention in a preferred embodiment, it is realized that modifications thereof might be made within the general structural principles of the invention. I intend the patent to cover all modifications with in the scope I claim: 1. For use "witha blackboard chalk rail havinga beaded edge, an eraser holder provided with spring lips extending toward each other and adapted to take a resilient grip on the edge of the chalk rail. Y

2. For use with a blackboard chalk rail having a beaded edge, an eraser holder prorided with spring lips extending toward each other and adapted to take a resilient grip on the edge of the chalk rail, in combination with. a key extending between the lower of said lips and the under side of the chalk rail.

3. F or use'with' a blackboard chalk rail having a beaded edge, an eraser holder provided with spring lips extending toward each other and adapted to take a resilient grip on the edge of the chalk rail, in-combination with akey extending between one of saidlips and'the adjacent portion ofthe chalk rail.

lfFor use'with a blackboard chalk rail having a beaded-edge,an eraserholder provided with a downwardly extending curved spring lip toengage the upper edge ofthe chalk rail and an upwardly extending curved spring lip toextend under the rail, in com bination with a key adapted to lie Within the lower lip and against the under side of the rail. I

' 5. For use with a blackboard chalk. rail having a beaded edge, an eraser holder pro [vided with a downwardly extending curved spring lip to engage the upper edge of the 'chalk rail and an upwardly extending curved spring lip, longitudinally tapered,

' to extend under the rail, in combination with a longitudinally tapered key adapted to lie "within the lower lip and against the under 1 ol sheet metal, the lower edge of which is bent inwardly and upwardly, and which is apert'ured and the metal adjacent the aperture bent inwardly and downwardly, whereby oppositely disposed spring retaining lips are provided for engaging the edge of a blackboard chalk rail, in combination with a key to lie within the first mentioned lip and against the under side of the rail.

8. An eraser holder consisting of a piece of sheet metal, the lower edge 0 Which'is bent inwardly and upwardly-with a longi-. tudinal taper, and which is aperturedand th metal adjacent :the aperture bentflinwardly and downwardly, whereby oppositely disposed spring retaining lips are provided torengaging the edge of a blackboard chalk rail, in combination with a longitudinally tapered key to lie within the first mentioned lip and against the under side of the rail.

9. An eraser holder consisting of a piece of sheet metal, the end edgesof which are bent inwardly to form eraser retaining wings, the lower edge of which is bent inwardly and upwardly to form a spring retaininglip, andwhich is apertured and the metal adjacent the aperture bent inwardly and downwardly to form a spring lip to oooperate with the first mentioned lip to hold 7 said device on a blackboard chalk rail. V

10. An eraser holder consisting'of a piece of sheet metal, the end edges of which are bent inwardly ,to form eraser retaining wings, the lower edge of which is bent in:

wardly' and u-wardly to form a curved spring lip, and which is formed with twoapertures. with the metal atthe lower edges of said aperturesbent inwardly and downwardly to form spring lips cooperating with the aforesaid spring lips to engage said device with the chalk rail of a blackboard. a

11. An" eraser holder consisting of a piece of sheet metal, the end edges of which are bent inwardly to form eraser retaining wings, the lower edge of which is bent inwardly and upwardly to form a curved spring lip, and which is formed with two apertures with the metal at the lower edges of said apertures bent inwardly and downwardly toform spring lips, in combination with a key to lie within said first mentioned lip,

whereby the device may be engaged with the beaded edge of a blackboard chalk rail.

12. An eraser holder consisting of a plate having inwardly extending eraser retaining wings and provided with upwardly and downwardly extending spring lips adapted to engage the edge of a blackboard chalk V rail. V

JOSEPH P. KENNEDY, 

